package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * @author 陈书憬
 * @version 1.0
 * 自定义切面。实现公共字段自动填充处理逻辑
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    //切入点 扫描mapper包下所有文件  并且  找到运行时的方法 UPDATE\INSERT
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {
    }

    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws Exception {
        log.info("开始进行公共字段自动填充............");

        //获取到当前被拦截的方法上的数据库作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获取方法上的注解对象
        OperationType operationType = autoFill.value();//获取数据库操作类型

        //获取到当前被拦截的方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) {
            return;
        }
        Object entity = args[0];

        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据当前不同的操作类型，为对应的属性通过反射来赋值
        if (operationType == OperationType.INSERT) {
            Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
            Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
            Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
            Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);

            //通过反射为对象属性赋值
            setCreateTime.invoke(entity, now);
            setCreateUser.invoke(entity, currentId);
            setUpdateUser.invoke(entity, currentId);
            setUpdateTime.invoke(entity, now);
        } else if (operationType == OperationType.UPDATE) {
            Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
            Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            setUpdateUser.invoke(entity, currentId);
            setUpdateTime.invoke(entity, now);
        }
        log.info("公共字段自动填充完成............");
    }
}